Home / 142,642.56-196,838.40-78,976.80

Finding the Fourth Proportional to 142,642.56, 196,838.40 and 78,976.80

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Solution

The fourth proportional to 142,642.56, 196,838.40 and 78,976.80 is: 108,983.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,642.56 : 196,838.40 = 78,976.80 : x
  2. Step 2: Convert to fraction form
    142,642.56/196,838.40 = 78,976.80/x
  3. Step 3: Cross multiply
    142,642.56x = 196,838.40 × 78,976.80
  4. Step 4: Simplify right side
    142,642.56x = 15,545,666,949.12
  5. Step 5: Solve for x
    x = 15,545,666,949.12/142,642.56
  6. Step 6: Final answer
    x = 108,983.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.